Which statements are true about a grassland ecosystem? Grasslands receive less than

Which statements are true about a grassland ecosystem? Grasslands receive less than ten inches (twenty five cm) of rain per year.
A large variety of trees grow here,
Much grassland has been converted to grow crops,
Many birds of the grasslands build their nests on the ground,
The soil is rich in nutrients,
Europe and Asia are the only continents with no grasslands,